i have a 98 150 Fitch engine on my boat, my brother in law said he hears a ticking noise at mid range from the engine from passenger side of the boat. i thought i heard it the last time i went out, but i have stopped and put the boat in neutral and revved-up the engine and can't hear a thing, also he said he can't here it at full throttle. is there any thing you guys can think of that would make a noise like that only at mid range? any ideals or do i need to tell him to get a hearing test. thanks oldfishinfool